day01代码

1. 使用while循环打印1，2，3，4，5，7，8，9

# 使用while循环打印1，2，3，4，5，7，8，9
count = 0
while count < 10:
    count += 1
    if count == 6:
        continue
    print(count)

2.求和1-100

# 求1-100的和
sum_count = 0
count = 1
while count <= 100:
    sum_count += count
    count += 1
print(sum_count)

3.求和1-100偶数

# 求1-100偶数的和
sum_count = 0
count = 1
while count <= 100:
    if count % 2 == 0:  # 判断偶数
        sum_count += count
    count += 1
print(sum_count)

4.求和1-100奇数

# 求1-100奇数的和
sum_count = 0
count = 1
while count <= 100:
    if count % 2 != 0:  # 判断奇数
        sum_count += count
    count += 1
print(sum_count)

5.求1-2+3-4.......的和(100)

# 求1-2+3-4...到100的和
sum_count = 0
count = 1
while count <= 100:
    if count % 2 != 0:  # 判断奇数
        sum_count += count
    else:   # 判断为偶数
        sum_count -= count
    count += 1
print(sum_count)

6.用户登录三次机会

# 用户有三次登录机会
_username = 'tom'
_password = 'abc123'
count = 1
while count <= 3:
    name = input("请输入用户名：")
    password = input("请输入密码：")
    if name == _username and password == _password:
        print("登录成功")
        break
    else:
        if count == 3:
            print("退出")
        else:
            print("请再输入一次")
    count += 1